MAINT: Drop keyword argument drop

[Zeroto521]

• closes #xxxx
• whatsnew entry

Don't add this argument to control drop or not.
It totally could be simplified.

[codecov]

Codecov Report

Merging #814 (59517c9) into main (93aaefa) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #814   +/-   ##
=======================================
  Coverage   99.70%   99.70%           
=======================================
  Files         145      145           
  Lines        2026     2034    +8     
  Branches      441      450    +9     
=======================================
+ Hits         2020     2028    +8     
  Misses          1        1           
  Partials        5        5           

Impacted Files	Coverage Δ
dtoolkit/geoaccessor/dataframe/to_geoframe.py	100.00% <ø> (ø)
...olkit/geoaccessor/geodataframe/select_geom_type.py	100.00% <ø> (ø)
dtoolkit/geoaccessor/geodataframe/to_h3.py	100.00% <ø> (ø)
dtoolkit/geoaccessor/geoseries/geodistance.py	100.00% <ø> (ø)
dtoolkit/geoaccessor/geoseries/reverse_geocode.py	100.00% <ø> (ø)
dtoolkit/geoaccessor/geoseries/select_geom_type.py	100.00% <ø> (ø)
dtoolkit/geoaccessor/geoseries/to_h3.py	100.00% <ø> (ø)
dtoolkit/geoaccessor/geoseries/xy.py	100.00% <ø> (ø)
dtoolkit/geoaccessor/series/to_geoseries.py	100.00% <ø> (ø)
dtoolkit/geoaccessor/dataframe/from_wkb.py	100.00% <100.00%> (ø)
... and 8 more

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